Treat SyncCredentialsLost as an auth error

chrome/browser/sync/profile_sync_service.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #define CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #pragma once
 
 #include <list>
 #include <string>
@@ skipping 162 matching lines @@
                      SigninManager* signin,
                      StartBehavior start_behavior);
   virtual ~ProfileSyncService();
 
   // Initializes the object. This should be called every time an object of this
   // class is constructed.
   void Initialize();
 
   void RegisterAuthNotifications();
 
+  // Returns true if sync is enabled/not suppressed and the user is logged in.
+  // (being logged in does not mean that tokens are available - tokens may
+  // be missing because they have not loaded yet, or because they were deleted
+  // due to http://crbug.com/121755).
+  // Virtual to enable mocking in tests.
+  virtual bool IsSyncEnabledAndLoggedIn();
+
   // Return whether all sync tokens are loaded and available for the backend to
   // start up. Virtual to enable mocking in tests.
-  virtual bool AreCredentialsAvailable();
+  virtual bool IsSyncTokenAvailable();
 
   // Registers a data type controller with the sync service.  This
   // makes the data type controller available for use, it does not
   // enable or activate the synchronization of the data type (see
   // ActivateDataType).  Takes ownership of the pointer.
   void RegisterDataTypeController(
       browser_sync::DataTypeController* data_type_controller);
 
   // Returns the session model associator associated with this type, but only if
   // the associator is running.  If it is doing anything else, it will return
@@ skipping 550 matching lines @@
   browser_sync::Experiments current_experiments;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(
     const browser_sync::SyncProtocolError& error);
 
 
 #endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_